上接稳扎稳打Silverlight(19) - 2.0通信之调用REST服务，处理JSON格式, XML格式, RSS/ATOM格式的数据

using System; 
using System.Linq; 
using System.Runtime.Serialization; 
using System.ServiceModel; 
using System.ServiceModel.Activation; 
 
using System.ServiceModel.Web; 
using System.Collections.Generic; 
using System.Text; 
using System.IO; 
 
/// <summary> 
/// 提供 REST 服务的类 
/// 注：Silverlight只支持 GET 和 POST 
/// </summary> 
[ServiceContract] 
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] 
public  class REST 
{ 
         /// <summary> 
         /// 用于演示返回 XML（对象） 的 REST 服务 
         /// </summary> 
         /// <param name="name"></param> 
         /// <returns></returns> 
        [OperationContract] 
        [WebGet(UriTemplate =  "User/{name}/xml", ResponseFormat = WebMessageFormat.Xml)] 
         public User HelloXml( string name) 
        { 
                 return  new User { Name = name, DayOfBirth =  new DateTime(1980, 2, 14) }; 
        } 
 
         /// <summary> 
         /// 用于演示返回 XML（集合） 的 REST 服务 
         /// </summary> 
         /// <returns></returns> 
        [OperationContract] 
        [WebGet(UriTemplate =  "Users/xml", ResponseFormat = WebMessageFormat.Xml)] 
         public List<User> HelloXml2() 
        { 
                 return  new List<User>    
                {    
                         new User(){ Name =  "webabcd01", DayOfBirth =  new DateTime(1980, 1, 1) }, 
                         new User(){ Name =  "webabcd02", DayOfBirth =  new DateTime(1980, 2, 2) }, 
                         new User(){ Name =  "webabcd03", DayOfBirth =  new DateTime(1980, 3, 3) }, 
                }; 
        } 
} 

<UserControl x:Class="Silverlight20.Communication.Xml" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
        <StackPanel HorizontalAlignment="Left" Width="600"> 

                <TextBox x:Name="txtMsgXml" Margin="5" /> 
                <TextBox x:Name="txtMsgXml2" Margin="5" /> 

        </StackPanel> 
</UserControl>

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Shapes; 
 
using System.Xml.Linq; 
using System.IO; 
 
namespace Silverlight20.Communication 
{ 
         public partial  class Xml : UserControl 
        { 
                 public Xml() 
                { 
                        InitializeComponent(); 
 
                         // 演示如何处理 XML（对象） 
                        XmlDemo(); 
 
                         // 演示如何处理 XML（集合） 
                        XmlDemo2(); 
                } 
 
                 /// <summary> 
                 /// 演示如何处理 XML（对象） 
                 /// </summary> 
                 void XmlDemo() 
                { 
                         // REST 服务的 URL 
                        Uri uri =  new Uri( "http://localhost:3036/REST.svc/User/webabcd/xml", UriKind.Absolute); 
 
                        // 实例化 WebClient 
                        System.Net.WebClient client = new System.Net.WebClient(); 
 
                        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(xml_DownloadStringCompleted); 
                        client.DownloadStringAsync(uri); 
 
                        txtMsgXml.Text = "读取 XML（对象） 数据中。。。"; 
                } 
 
                void xml_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
                { 
                        if (e.Error != null) 
                        { 
                                // 发生错误的话，则打印出来 
                                txtMsgXml.Text = e.Error.ToString(); 
                                return; 
                        } 
 
                        // 将获得的字符串转换为 XML（对象） 
                        var buffer = System.Text.Encoding.UTF8.GetBytes(e.Result); 
                        var ms = new MemoryStream(buffer); 
 
                        XElement xmlObject = XElement.Load(ms); 
 
                        txtMsgXml.Text = e.Result + "\r\n"; 
                        XNamespace ns = "http://webabcd.cnblogs.com/"; 
                        txtMsgXml.Text += string.Format("姓名: {0}, 生日: {1}", 
                                (string)xmlObject.Element(ns + "Name"), 
                                ((DateTime)xmlObject.Element(ns + "DayOfBirth")).ToString("yyyy-MM-dd")); 
 
                        /*    
                         * 总结： 
                         * XElement - 表示一个 XML 元素 
                         *         XElement.Element - XML 元素内的 XML 元素 
                         *         XElement.Attribute - XML 元素内的 XML 属性 
                         *         XElement.Load(Stream) - 使用指定流创建一个 XElement 对象 
                         *         XElement.Parse(String) - 解析指定的 XML 字符串为一个 XElement 对象 
                         * XAttribute - 表示一个 XML 属性 
                         */ 
                } 
 
                /// <summary> 
                /// 演示如何处理 XML（集合） 
                /// </summary> 
                void XmlDemo2() 
                { 
                        // REST 服务的 URL 
                        Uri uri = new Uri("http://localhost:3036/REST.svc/Users/xml", UriKind.Absolute); 
 
                        // 实例化 WebClient 
                        System.Net.WebClient client = new System.Net.WebClient(); 
 
                        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(xml2_DownloadStringCompleted); 
                        client.DownloadStringAsync(uri); 
 
                        txtMsgXml2.Text = "读取 XML（集合） 数据中。。。"; 
                } 
 
                void xml2_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
                { 
                        if (e.Error != null) 
                        { 
                                // 发生错误的话，则打印出来 
                                txtMsgXml2.Text = e.Error.ToString(); 
                                return; 
                        } 
 
                        // 将获得的字符串转换为 XML（集合） 
                        XDocument xmlObject = XDocument.Parse(e.Result); 
 
                        txtMsgXml2.Text = e.Result + "\r\n"; 
                        XNamespace ns = "http://webabcd.cnblogs.com/"; 
                        var obj = from p in xmlObject.Elements(ns + "ArrayOfUser").Elements(ns + "User") 
                                            where p.Element(ns + "Name").Value == "webabcd02" 
                                            select new { Name = (string)p.Element(ns + "Name"), DayOfBirth = (DateTime)p.Element(ns + "DayOfBirth") }; 
                         
                        txtMsgXml2.Text += string.Format("姓名: {0}, 生日: {1}", 
                                obj.First().Name, 
                                obj.First().DayOfBirth.ToString("yyyy-MM-dd")); 
 
 
                        /*    
                         * 总结： 
                         * LINQ to XML 相当的方便 
                         */ 
                } 
        } 
}

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
 
public partial  class Proxy : System.Web.UI.Page 
{ 
         protected  void Page_Load( object sender, EventArgs e) 
        { 
                 // 获取某个 url 地址的 html 并在页面上输出 
 
                 string url = Request.QueryString[ "url"]; 
 
                System.Net.WebClient client =  new System.Net.WebClient(); 
                client.Encoding = System.Text.Encoding.UTF8; 
 
                Response.Write(client.DownloadString(url)); 
                Response.End(); 
        } 
}

<UserControl x:Class="Silverlight20.Communication.RssAtom" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
        <StackPanel HorizontalAlignment="Left" > 

                <TextBox x:Name="txtMsgRss" Width="600" Margin="5" /> 

                <StackPanel Orientation="Horizontal"> 
                 
                        <ListBox x:Name="list" Width="300" Margin="5" SelectionChanged="list_SelectionChanged"> 
                                <ListBox.ItemTemplate> 
                                        <DataTemplate> 
                                                <TextBlock Text="{Binding Title.Text}"></TextBlock> 
                                        </DataTemplate> 
                                </ListBox.ItemTemplate> 
                        </ListBox> 

                        <TextBlock x:Name="detail" Width="300" Margin="5" Text="{Binding Summary.Text}" TextWrapping="Wrap" /> 
                         
                </StackPanel> 
                 
        </StackPanel> 
</UserControl>

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Shapes; 
 
using System.Xml; 
using System.IO; 
using System.ServiceModel.Syndication; 
 
namespace Silverlight20.Communication 
{ 
         public partial  class RssAtom : UserControl 
        { 
                 public RssAtom() 
                { 
                        InitializeComponent(); 
 
                         // 演示如何处理 Rss/Atom 
                        RssDemo(); 
                } 
 
                 /// <summary> 
                 /// 演示如何处理 Rss/Atom 
                 /// </summary> 
                 void RssDemo() 
                { 
                         // 让一个代理页面去请求相关的 Rss/Atom（如果用Silverlight直接去请求，则需要在目标域的根目录下配置策略文件） 
                        Uri uri =  new Uri( "http://localhost:3036/Proxy.aspx?url=http://webabcd.cnblogs.com/rss", UriKind.Absolute); 
 
                        // 实例化 WebClient 
                        System.Net.WebClient client = new System.Net.WebClient(); 
 
                        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(rss_DownloadStringCompleted); 
                        client.DownloadStringAsync(uri); 
 
                        txtMsgRss.Text = "读取 RSS 数据中。。。"; 
                } 
 
                void rss_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
                { 
                        if (e.Error != null) 
                        { 
                                // 发生错误的话，则打印出来 
                                txtMsgRss.Text = e.Error.ToString(); 
                                return; 
                        } 
 
                        // 将获得的字符串转换为 XmlReader 
                        var buffer = System.Text.Encoding.UTF8.GetBytes(e.Result); 
                        var ms = new MemoryStream(buffer); 
                        XmlReader reader = XmlReader.Create(ms); 
 
                        // 从指定的 XmlReader 中加载，以生成 SyndicationFeed 
                        SyndicationFeed feed = SyndicationFeed.Load(reader); 
 
                        // 设置 list 的数据源为 Rss/Atom 的项集合（SyndicationFeed.Items） 
                        list.ItemsSource = feed.Items; 
                        txtMsgRss.Text = e.Result + "\r\n"; 
                } 
 
                private void list_SelectionChanged(object sender, SelectionChangedEventArgs e) 
                { 
                        // 设置 detail 的数据上下文为 Rss/Atom 的指定项（SyndicationItem） 
                        detail.DataContext = list.SelectedItem as SyndicationItem; 
                } 
        } 
}